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  • TPSM8291x Step-Down Power Module Evaluation Module

    • SLVUCG4 October   2022 TPSM82912 , TPSM82913

       

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  • TPSM8291x Step-Down Power Module Evaluation Module
  1.   TPSM8291xEVM Evaluation Module
  2.   Trademarks
  3. 1Introduction
    1. 1.1 Performance Specification
    2. 1.2 Modifications
      1. 1.2.1 Input and Output Capacitors
      2. 1.2.2 Configurable Enable Threshold Voltage
      3. 1.2.3 NR/SS Capacitor
      4. 1.2.4 Feedforward Capacitor
      5. 1.2.5 S-CONF Resistor
      6. 1.2.6 Single LC Filter Operation
  4. 2Setup
    1. 2.1 Input and Output Connector Descriptions
    2. 2.2 Ripple Measurement Setup
  5. 3 Test Results
  6. 4 Board Layout
  7. 5Schematic and Bill of Materials
    1. 5.1 Schematic
  8. 6Bill of Materials
  9. IMPORTANT NOTICE
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EVM USER'S GUIDE

TPSM8291x Step-Down Power Module Evaluation Module

1 TPSM8291xEVM Evaluation Module

The TPSM8291xEVM (BSR213) facilitates the evaluation of the TPSM8291x 2-A and 3-A pin-to-pin compatible low-noise (< 20 μVRMS) and low-ripple (< 10 μVRMS) buck power modules in small 4.5-mm by 5.5-mm QFN packages. The BSR213-001 uses the 3-A TPSM82913 to output a 1.2-V output voltage from input voltages between 3 V and 17 V. The BSR213-002 uses the 2-A TPSM82912 to output a 3.3-V output voltage from input voltages up to 17 V. Due to its extremely low noise, the TPSM8291x is a high-efficiency alternative to low-dropout (LDO) linear regulators in noise-sensitive circuits, such as data converters, clocks, and amplifiers in telecom infrastructure, medical, test and measurement, and aerospace and defense applications.

Trademarks

All trademarks are the property of their respective owners.

1 Introduction

The TPSM8291x family of devices are low-noise, low-ripple, synchronous, step-down power modules in a small 4.5-mm × 5.5-mm × 1.8-mm QFN package. Two different devices in this family support 2 A or 3 A of output current.

1.1 Performance Specification

Table 1-1 and Table 1-2 provides a summary of the TPSM8291xEVM performance specifications.

Table 1-1 TPSM82913EVM Performance Specification Summary
SPECIFICATIONTEST CONDITIONSMINTYPMAXUNIT
Input voltageJP2 open or across 1 MHz and S-CONF31217V
Output voltage setpoint1.2V
Output current03A
S-CONF (R7) setting1 MHz with SYNC available, no spread spectrum, output discharge enabled52.3kΩ
Table 1-2 TPSM82912EVM Performance Specification Summary
SPECIFICATION

TEST CONDITIONS

MINTYPMAXUNIT
Input voltage3.51217V
Output voltage setpoint3.3V
Output current02A
S-CONF (R7) setting2.2 MHz with SYNC available, no spread spectrum, output discharge enabled27.4kΩ

1.2 Modifications

The printed-circuit board (PCB) for this EVM is designed to accommodate some modifications by the user. Additional input and output capacitors can be added. Also, the input voltage at which the IC turns on can be adjusted with two resistors, the soft-start time and low frequency noise filtering can be changed, a feedforward capacitor can be added, and the switching frequency, output discharge setting, and spread spectrum setting can be changed. See the device TPSM8291x 3-V to 17-V, 2-A/3-A Low Noise and Low Ripple Buck Power Module with Integrated Ferrite Bead Filter Compensation data sheet for details of the various settings.

1.2.1 Input and Output Capacitors

C4 is provided for an additional input capacitor. This capacitor is not required for proper operation but can be used to reduce the input voltage ripple.

C10, C14, and C15 are provided for additional bulk output capacitors. These capacitors are not required for proper operation but can be used to reduce the output voltage ripple. The total output capacitance must remain within the recommended range in the TPSM8291x 3-V to 17-V, 2-A/3-A Low Noise and Low Ripple Buck Power Module with Integrated Ferrite Bead Filter Compensation data sheet for proper operation. C11 and C16 are provided for high-frequency bypass capacitors.

1.2.2 Configurable Enable Threshold Voltage

With J5 removed, R3 and R5 can be installed to set a user-selectable input voltage at which the IC turns on.

 

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